13. “Can't you read?” Mary said ,____ to the notice.
A. angrily pointing
B. and point angrily
C. angrily pointed
D. and angrily pointing
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14. ____ a reply, he decided to write again.
A. Not receiving
B. Receiving not
C. Not having received
D. Having not received
15. The visiting Minister expressed his satisfaction with the talks, ____ that he had enjoyed his stay here.
A. having added
B. to add
C. adding
D. added
气旋和反气旋的强度一般用( )来表示。
A. 中心气压值
B. 闭合等压线的根数
C. 降水的强度
D. 旋转程度
气旋按热力结构分为( )。
A. 热带气旋
B. 温带气旋
C. 锋面气旋和无锋面气旋
D. 极地气旋